26 + 4 u = 7 p
5 u - 20 = 5 p
Find the following values.
- 1 u
- 1 p
(a)
26 + 4 u = 7 p --- (1)
5 u - 20 = 5 p --- (2)
Make p the same.
(1) x 5
130 + 20 u = 35 p --- (3)
(2) x 7
35 u - 140 = 35 p --- (4)
(4) = (3)
35 u - 140 = 130 + 20 u
35 u - 20 u = 130 + 140
15 u = 270
1 u = 270 ÷ 15 = 18
(b)
Substitute 1 u = 18 into (2).
5 u - 20 = 5 p
5 x 18 - 20 = 5 p
90 - 20 = 5 p
70 = 5 p
1 p = 70 ÷ 5 = 14
Answer(s): (a) 18; (b) 14